/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/ConvexHalfEdgeStructureData.h
Get the next half edge on the same plane HalfEdgeIndex must be in range [0,NumHalfEdges()) return value is in range [0,NumHalfEdges())
int32 GetNextHalfEdge ( int32 HalfEdgeIndex ) const